2010AJ....140..968R

Query : 2010AJ....140..968R

2010AJ....140..968R - Astron. J., 140, 968-972 (2010/October-0)

A cluster of compact radio sources in W40.

RODRIGUEZ L.F., RODNEY S.A. and REIPURTH B.

Abstract (from CDS):

We present deep 3.6 cm radio continuum observations of the H II region W40 obtained using the Very Large Array (VLA) in its A and B configurations. We detect a total of 20 compact radio sources in a region of 4'x4', with 11 of them concentrated in a band with 30'' of extent. We also present JHK photometry of the W40 cluster taken with the QUIRC instrument on the University of Hawaii 2.2 m telescope. These data reveal that 15 of the 20 VLA sources have infrared counterparts, and 10 show radio variability with periods less than 20 days. Based on these combined radio and IR data, we propose that eight of the radio sources are candidate ultracompact H II regions, seven are likely to be young stellar objects, and two may be shocked interstellar gas.

Abstract Copyright: ∼

Journal keyword(s): H II regions - infrared: stars - open clusters and associations: individual: W40 - radio continuum: stars - stars: formation

VizieR on-line data: <Available at CDS (J/AJ/140/968): table1.dat table2.dat>

Nomenclature: Table 1: [RRR2010] NNN (Nos 1-271). Table 2: [RRR2010] W40-VLA NN (Nos 1-20).

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
2 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
3 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
4 2MASS J18311482-0203497 Y*O 18 31 14.8261452312 -02 03 49.987022364           B1 21 0
5 [RRR2010] W40-VLA 2 Y*? 18 31 15.279 -02 04 15.19           ~ 4 0
6 [RRR2010] W40-VLA 3 * 18 31 22.328 -02 06 19.49           ~ 6 0
7 2MASS J18312324-0206179 Y*? 18 31 23.2464854856 -02 06 17.998267212           ~ 4 0
8 GBS-VLA J183123.62-020535.8 * 18 31 23.6220856416 -02 05 35.752729488           ~ 8 0
9 [RRR2010] W40-VLA 6 Rad 18 31 23.687 -02 05 27.90           ~ 1 0
10 NAME W 40 IRS 2a * 18 31 23.9744924952 -02 05 29.491630944           ~ 14 1
11 NAME W 40 Cluster Cl* 18 31 25 -02 05.8           ~ 10 2
12 2MASS J18312601-0205169 Y*? 18 31 26.0248797696 -02 05 16.956048228           ~ 10 0
13 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
14 [RRR2010] W40-VLA 9 Rad 18 31 27.312 -02 05 04.44           ~ 3 0
15 2MASS J18312745-0205118 Y*? 18 31 27.4602697752 -02 05 11.934787164           ~ 9 0
16 CXOW40 J183127.58-020517.7 * 18 31 27.5834553600 -02 05 17.671107732           ~ 4 0
17 GBS-VLA J183127.64-020513.5 * 18 31 27.6441754248 -02 05 13.378511148           ~ 4 0
18 2MASS J18312765-0205096 Y*O 18 31 27.6558573720 -02 05 09.694706676           ~ 11 0
19 [RRR2010] W40-VLA 14 Rad 18 31 27.681 -02 05 19.66           ~ 3 0
20 CXOW40 J183127.84-020523.5 * 18 31 27.827 -02 05 22.86     15.0     O9.5 25 1
21 GBS-VLA J183128.01-020517.9 * 18 31 28.0015403280 -02 05 17.187564732           ~ 4 0
22 2MASS J18312866-0205297 Y*? 18 31 28.6632266856 -02 05 29.804888544           ~ 8 0
23 [RRR2010] W40-VLA 19 Rad 18 31 28.683 -02 05 22.25           ~ 2 0
24 2MASS J18313020-0207180 Y*? 18 31 30.206 -02 07 18.01           ~ 4 0

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